"Extra" vs. "additional": when to use each word

What is similar?
Both "extra" and "additional" describe something that is more than what is usual, expected, or needed, and both can refer to quantities, items, or effort added beyond a base amount.
What is different?
"Extra" often emphasizes surplus or abundance and can imply more than necessary, sometimes with informal tone. "Additional" is more formal and neutral, focusing on anything that is added or in addition to what already exists, without necessarily implying excess.
Which one is more common?

Examples of usage
Extra- We ordered extra pizza in case more guests arrived.
- You can get an extra blanket from the closet.
- She worked extra hours last week.
- Please provide any additional information you may have.
- We will need additional chairs for the meeting.
- The company hired additional staff for the project.